[asterisk-users] ERROR during high volume MoH dialplan

[Joseph Smith]

Hello,

I've recently setup a small load test against an instance of Asterisks.  I've tested on asterisk 13.5 and 14.6 with the same results.

I am using PJSIP.  My dial plan is,

[test]

exten => 1001,1,Answer

exten => 1001,n,MusicOnHold(15)

exten => 1001,n,Hangup

I am using SIPP to test.  I can share XML if desired but it simply waits on the line while music plays for 8 seconds.  I used sippycup to generate it with the following steps in the yaml file.


steps:

  - invite

  - wait_for_answer

  - ack_answer

  - sleep 8

  - send_bye

At around 500 calls per second I begin to see the following ERRORs,


[Aug 28 17:46:14] ERROR[26150][C-00005594]: frame.c:343 ast_frdup: Excessive refcount 100000 reached on ao2 object 0x26bffc0

[Aug 28 17:46:14] ERROR[26150][C-00005594]: frame.c:343 ast_frdup: FRACK!, Failed assertion Excessive refcount 100000 reached on ao2 object 0x26bffc0 (0)

Got 19 backtrace records

#0: [0x45d229] /usr/sbin/asterisk(__ao2_ref+0x1a9) [0x45d229]

#1: [0x526ce6] /usr/sbin/asterisk(ast_frdup+0x116) [0x526ce6]

#2: [0x5fa616] /usr/sbin/asterisk(ast_translate+0x306) [0x5fa616]

#3: [0x4bf16b] /usr/sbin/asterisk(ast_write+0x104b) [0x4bf16b]

#4: [0x7efeb578230b] /usr/lib/asterisk/modules/res_musiconhold.so(+0x430b) [0x7efeb578230b]

#5: [0x4b5b52] /usr/sbin/asterisk() [0x4b5b52]

#6: [0x4c259c] /usr/sbin/asterisk() [0x4c259c]

#7: [0x4c4a45] /usr/sbin/asterisk() [0x4c4a45]

#8: [0x7efeb578478d] /usr/lib/asterisk/modules/res_musiconhold.so(+0x678d) [0x7efeb578478d]

#9: [0x58ec79] /usr/sbin/asterisk(pbx_exec+0xb9) [0x58ec79]

#10: [0x582e84] /usr/sbin/asterisk() [0x582e84]

#11: [0x584e7c] /usr/sbin/asterisk() [0x584e7c]

#12: [0x5863fb] /usr/sbin/asterisk() [0x5863fb]

#13: [0x60002a] /usr/sbin/asterisk() [0x60002a]


I've also seen similar behavior when using playback instead of MusicOnHold.  CPU usage gets around 50%.  Can anyone enlighten me on the meaning and cause of the error?  Is there some steps (config etc) that can be taken to alleviate the issue?

Thanks
Joseph




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